Hyperbole (hi-PER-buh-lee) is language that is obviously exaggerated and not meant to be taken literally. Writers often use hyperbole for emphasis or to be funny.
Hyperbole: The Best Thing Ever
You can find hyperbole in plenty of English idioms: She’s asked a million questions. You could have knocked me over with a feather. He’s as quiet as a mouse. Now I’ve seen everything. See More . . .
https://www.grammarly.com/blog/hyperbole/